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FFmpeg/libswscale/utils.c

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  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or modify

  7.  * it under the terms of the GNU General Public License as published by

  8.  * the Free Software Foundation; either version 2 of the License, or

  9.  * (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  14.  * GNU General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU General Public License

  17.  * along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  *

  20.  * the C code (not assembly, mmx, ...) of this file can be used

  21.  * under the LGPL license too

  22.  */

  23. 

  24. #define _SVID_SOURCE //needed for MAP_ANONYMOUS

  25. #include <inttypes.h>

  26. #include <string.h>

  27. #include <math.h>

  28. #include <stdio.h>

  29. #include "config.h"

  30. #include <assert.h>

  31. #if HAVE_SYS_MMAN_H

  32. #include <sys/mman.h>

  33. #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)

  34. #define MAP_ANONYMOUS MAP_ANON

  35. #endif

  36. #endif

  37. #if HAVE_VIRTUALALLOC

  38. #define WIN32_LEAN_AND_MEAN

  39. #include <windows.h>

  40. #endif

  41. #include "swscale.h"

  42. #include "swscale_internal.h"

  43. #include "rgb2rgb.h"

  44. #include "libavutil/intreadwrite.h"

  45. #include "libavutil/x86_cpu.h"

  46. #include "libavutil/avutil.h"

  47. #include "libavutil/bswap.h"

  48. #include "libavutil/pixdesc.h"

  49. 

  50. unsigned swscale_version(void)

  51. {

  52.     return LIBSWSCALE_VERSION_INT;

  53. }

  54. 

  55. const char *swscale_configuration(void)

  56. {

  57.     return FFMPEG_CONFIGURATION;

  58. }

  59. 

  60. const char *swscale_license(void)

  61. {

  62. #define LICENSE_PREFIX "libswscale license: "

  63.     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  64. }

  65. 

  66. #define RET 0xC3 //near return opcode for x86

  67. 

  68. #define isSupportedIn(x)    (       \

  69.            (x)==PIX_FMT_YUV420P     \

  70.         || (x)==PIX_FMT_YUVA420P    \

  71.         || (x)==PIX_FMT_YUYV422     \

  72.         || (x)==PIX_FMT_UYVY422     \

  73.         || (x)==PIX_FMT_RGB48BE     \

  74.         || (x)==PIX_FMT_RGB48LE     \

  75.         || (x)==PIX_FMT_RGB32       \

  76.         || (x)==PIX_FMT_RGB32_1     \

  77.         || (x)==PIX_FMT_BGR24       \

  78.         || (x)==PIX_FMT_BGR565      \

  79.         || (x)==PIX_FMT_BGR555      \

  80.         || (x)==PIX_FMT_BGR32       \

  81.         || (x)==PIX_FMT_BGR32_1     \

  82.         || (x)==PIX_FMT_RGB24       \

  83.         || (x)==PIX_FMT_RGB565      \

  84.         || (x)==PIX_FMT_RGB555      \

  85.         || (x)==PIX_FMT_GRAY8       \

  86.         || (x)==PIX_FMT_YUV410P     \

  87.         || (x)==PIX_FMT_YUV440P     \

  88.         || (x)==PIX_FMT_NV12        \

  89.         || (x)==PIX_FMT_NV21        \

  90.         || (x)==PIX_FMT_GRAY16BE    \

  91.         || (x)==PIX_FMT_GRAY16LE    \

  92.         || (x)==PIX_FMT_YUV444P     \

  93.         || (x)==PIX_FMT_YUV422P     \

  94.         || (x)==PIX_FMT_YUV411P     \

  95.         || (x)==PIX_FMT_PAL8        \

  96.         || (x)==PIX_FMT_BGR8        \

  97.         || (x)==PIX_FMT_RGB8        \

  98.         || (x)==PIX_FMT_BGR4_BYTE   \

  99.         || (x)==PIX_FMT_RGB4_BYTE   \

  100.         || (x)==PIX_FMT_YUV440P     \

  101.         || (x)==PIX_FMT_MONOWHITE   \

  102.         || (x)==PIX_FMT_MONOBLACK   \

  103.         || (x)==PIX_FMT_YUV420P16LE   \

  104.         || (x)==PIX_FMT_YUV422P16LE   \

  105.         || (x)==PIX_FMT_YUV444P16LE   \

  106.         || (x)==PIX_FMT_YUV420P16BE   \

  107.         || (x)==PIX_FMT_YUV422P16BE   \

  108.         || (x)==PIX_FMT_YUV444P16BE   \

  109.     )

  110. 

  111. int sws_isSupportedInput(enum PixelFormat pix_fmt)

  112. {

  113.     return isSupportedIn(pix_fmt);

  114. }

  115. 

  116. #define isSupportedOut(x)   (       \

  117.            (x)==PIX_FMT_YUV420P     \

  118.         || (x)==PIX_FMT_YUVA420P    \

  119.         || (x)==PIX_FMT_YUYV422     \

  120.         || (x)==PIX_FMT_UYVY422     \

  121.         || (x)==PIX_FMT_YUV444P     \

  122.         || (x)==PIX_FMT_YUV422P     \

  123.         || (x)==PIX_FMT_YUV411P     \

  124.         || isRGB(x)                 \

  125.         || isBGR(x)                 \

  126.         || (x)==PIX_FMT_NV12        \

  127.         || (x)==PIX_FMT_NV21        \

  128.         || (x)==PIX_FMT_GRAY16BE    \

  129.         || (x)==PIX_FMT_GRAY16LE    \

  130.         || (x)==PIX_FMT_GRAY8       \

  131.         || (x)==PIX_FMT_YUV410P     \

  132.         || (x)==PIX_FMT_YUV440P     \

  133.         || (x)==PIX_FMT_YUV420P16LE   \

  134.         || (x)==PIX_FMT_YUV422P16LE   \

  135.         || (x)==PIX_FMT_YUV444P16LE   \

  136.         || (x)==PIX_FMT_YUV420P16BE   \

  137.         || (x)==PIX_FMT_YUV422P16BE   \

  138.         || (x)==PIX_FMT_YUV444P16BE   \

  139.     )

  140. 

  141. int sws_isSupportedOutput(enum PixelFormat pix_fmt)

  142. {

  143.     return isSupportedOut(pix_fmt);

  144. }

  145. 

  146. #define usePal(x) (av_pix_fmt_descriptors[x].flags & PIX_FMT_PAL)

  147. 

  148. extern const int32_t ff_yuv2rgb_coeffs[8][4];

  149. 

  150. const char *sws_format_name(enum PixelFormat format)

  151. {

  152.     if ((unsigned)format < PIX_FMT_NB && av_pix_fmt_descriptors[format].name)

  153.         return av_pix_fmt_descriptors[format].name;

  154.     else

  155.         return "Unknown format";

  156. }

  157. 

  158. static double getSplineCoeff(double a, double b, double c, double d, double dist)

  159. {

  160. //    printf("%f %f %f %f %f\n", a,b,c,d,dist);

  161.     if (dist<=1.0) return ((d*dist + c)*dist + b)*dist +a;

  162.     else           return getSplineCoeff(        0.0,

  163.                                           b+ 2.0*c + 3.0*d,

  164.                                                  c + 3.0*d,

  165.                                          -b- 3.0*c - 6.0*d,

  166.                                          dist-1.0);

  167. }

  168. 

  169. static int initFilter(int16_t **outFilter, int16_t **filterPos, int *outFilterSize, int xInc,

  170.                       int srcW, int dstW, int filterAlign, int one, int flags,

  171.                       SwsVector *srcFilter, SwsVector *dstFilter, double param[2])

  172. {

  173.     int i;

  174.     int filterSize;

  175.     int filter2Size;

  176.     int minFilterSize;

  177.     int64_t *filter=NULL;

  178.     int64_t *filter2=NULL;

  179.     const int64_t fone= 1LL<<54;

  180.     int ret= -1;

  181. #if ARCH_X86

  182.     if (flags & SWS_CPU_CAPS_MMX)

  183.         __asm__ volatile("emms\n\t"::: "memory"); //FIXME this should not be required but it IS (even for non-MMX versions)

  184. #endif

  185. 

  186.     // NOTE: the +1 is for the MMX scaler which reads over the end

  187.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW+1)*sizeof(int16_t), fail);

  188. 

  189.     if (FFABS(xInc - 0x10000) <10) { // unscaled

  190.         int i;

  191.         filterSize= 1;

  192.         FF_ALLOCZ_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  193. 

  194.         for (i=0; i<dstW; i++) {

  195.             filter[i*filterSize]= fone;

  196.             (*filterPos)[i]=i;

  197.         }

  198. 

  199.     } else if (flags&SWS_POINT) { // lame looking point sampling mode

  200.         int i;

  201.         int xDstInSrc;

  202.         filterSize= 1;

  203.         FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  204. 

  205.         xDstInSrc= xInc/2 - 0x8000;

  206.         for (i=0; i<dstW; i++) {

  207.             int xx= (xDstInSrc - ((filterSize-1)<<15) + (1<<15))>>16;

  208. 

  209.             (*filterPos)[i]= xx;

  210.             filter[i]= fone;

  211.             xDstInSrc+= xInc;

  212.         }

  213.     } else if ((xInc <= (1<<16) && (flags&SWS_AREA)) || (flags&SWS_FAST_BILINEAR)) { // bilinear upscale

  214.         int i;

  215.         int xDstInSrc;

  216.         filterSize= 2;

  217.         FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  218. 

  219.         xDstInSrc= xInc/2 - 0x8000;

  220.         for (i=0; i<dstW; i++) {

  221.             int xx= (xDstInSrc - ((filterSize-1)<<15) + (1<<15))>>16;

  222.             int j;

  223. 

  224.             (*filterPos)[i]= xx;

  225.             //bilinear upscale / linear interpolate / area averaging

  226.             for (j=0; j<filterSize; j++) {

  227.                 int64_t coeff= fone - FFABS((xx<<16) - xDstInSrc)*(fone>>16);

  228.                 if (coeff<0) coeff=0;

  229.                 filter[i*filterSize + j]= coeff;

  230.                 xx++;

  231.             }

  232.             xDstInSrc+= xInc;

  233.         }

  234.     } else {

  235.         int xDstInSrc;

  236.         int sizeFactor;

  237. 

  238.         if      (flags&SWS_BICUBIC)      sizeFactor=  4;

  239.         else if (flags&SWS_X)            sizeFactor=  8;

  240.         else if (flags&SWS_AREA)         sizeFactor=  1; //downscale only, for upscale it is bilinear

  241.         else if (flags&SWS_GAUSS)        sizeFactor=  8;   // infinite ;)

  242.         else if (flags&SWS_LANCZOS)      sizeFactor= param[0] != SWS_PARAM_DEFAULT ? ceil(2*param[0]) : 6;

  243.         else if (flags&SWS_SINC)         sizeFactor= 20; // infinite ;)

  244.         else if (flags&SWS_SPLINE)       sizeFactor= 20;  // infinite ;)

  245.         else if (flags&SWS_BILINEAR)     sizeFactor=  2;

  246.         else {

  247.             sizeFactor= 0; //GCC warning killer

  248.             assert(0);

  249.         }

  250. 

  251.         if (xInc <= 1<<16)      filterSize= 1 + sizeFactor; // upscale

  252.         else                    filterSize= 1 + (sizeFactor*srcW + dstW - 1)/ dstW;

  253. 

  254.         if (filterSize > srcW-2) filterSize=srcW-2;

  255. 

  256.         FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  257. 

  258.         xDstInSrc= xInc - 0x10000;

  259.         for (i=0; i<dstW; i++) {

  260.             int xx= (xDstInSrc - ((filterSize-2)<<16)) / (1<<17);

  261.             int j;

  262.             (*filterPos)[i]= xx;

  263.             for (j=0; j<filterSize; j++) {

  264.                 int64_t d= ((int64_t)FFABS((xx<<17) - xDstInSrc))<<13;

  265.                 double floatd;

  266.                 int64_t coeff;

  267. 

  268.                 if (xInc > 1<<16)

  269.                     d= d*dstW/srcW;

  270.                 floatd= d * (1.0/(1<<30));

  271. 

  272.                 if (flags & SWS_BICUBIC) {

  273.                     int64_t B= (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1<<24);

  274.                     int64_t C= (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1<<24);

  275.                     int64_t dd = ( d*d)>>30;

  276.                     int64_t ddd= (dd*d)>>30;

  277. 

  278.                     if      (d < 1LL<<30)

  279.                         coeff = (12*(1<<24)-9*B-6*C)*ddd + (-18*(1<<24)+12*B+6*C)*dd + (6*(1<<24)-2*B)*(1<<30);

  280.                     else if (d < 1LL<<31)

  281.                         coeff = (-B-6*C)*ddd + (6*B+30*C)*dd + (-12*B-48*C)*d + (8*B+24*C)*(1<<30);

  282.                     else

  283.                         coeff=0.0;

  284.                     coeff *= fone>>(30+24);

  285.                 }

  286. /*                else if (flags & SWS_X) {

  287.                     double p= param ? param*0.01 : 0.3;

  288.                     coeff = d ? sin(d*PI)/(d*PI) : 1.0;

  289.                     coeff*= pow(2.0, - p*d*d);

  290.                 }*/

  291.                 else if (flags & SWS_X) {

  292.                     double A= param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;

  293.                     double c;

  294. 

  295.                     if (floatd<1.0)

  296.                         c = cos(floatd*M_PI);

  297.                     else

  298.                         c=-1.0;

  299.                     if (c<0.0)      c= -pow(-c, A);

  300.                     else            c=  pow( c, A);

  301.                     coeff= (c*0.5 + 0.5)*fone;

  302.                 } else if (flags & SWS_AREA) {

  303.                     int64_t d2= d - (1<<29);

  304.                     if      (d2*xInc < -(1LL<<(29+16))) coeff= 1.0 * (1LL<<(30+16));

  305.                     else if (d2*xInc <  (1LL<<(29+16))) coeff= -d2*xInc + (1LL<<(29+16));

  306.                     else coeff=0.0;

  307.                     coeff *= fone>>(30+16);

  308.                 } else if (flags & SWS_GAUSS) {

  309.                     double p= param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  310.                     coeff = (pow(2.0, - p*floatd*floatd))*fone;

  311.                 } else if (flags & SWS_SINC) {

  312.                     coeff = (d ? sin(floatd*M_PI)/(floatd*M_PI) : 1.0)*fone;

  313.                 } else if (flags & SWS_LANCZOS) {

  314.                     double p= param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  315.                     coeff = (d ? sin(floatd*M_PI)*sin(floatd*M_PI/p)/(floatd*floatd*M_PI*M_PI/p) : 1.0)*fone;

  316.                     if (floatd>p) coeff=0;

  317.                 } else if (flags & SWS_BILINEAR) {

  318.                     coeff= (1<<30) - d;

  319.                     if (coeff<0) coeff=0;

  320.                     coeff *= fone >> 30;

  321.                 } else if (flags & SWS_SPLINE) {

  322.                     double p=-2.196152422706632;

  323.                     coeff = getSplineCoeff(1.0, 0.0, p, -p-1.0, floatd) * fone;

  324.                 } else {

  325.                     coeff= 0.0; //GCC warning killer

  326.                     assert(0);

  327.                 }

  328. 

  329.                 filter[i*filterSize + j]= coeff;

  330.                 xx++;

  331.             }

  332.             xDstInSrc+= 2*xInc;

  333.         }

  334.     }

  335. 

  336.     /* apply src & dst Filter to filter -> filter2

  337.        av_free(filter);

  338.     */

  339.     assert(filterSize>0);

  340.     filter2Size= filterSize;

  341.     if (srcFilter) filter2Size+= srcFilter->length - 1;

  342.     if (dstFilter) filter2Size+= dstFilter->length - 1;

  343.     assert(filter2Size>0);

  344.     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size*dstW*sizeof(*filter2), fail);

  345. 

  346.     for (i=0; i<dstW; i++) {

  347.         int j, k;

  348. 

  349.         if(srcFilter) {

  350.             for (k=0; k<srcFilter->length; k++) {

  351.                 for (j=0; j<filterSize; j++)

  352.                     filter2[i*filter2Size + k + j] += srcFilter->coeff[k]*filter[i*filterSize + j];

  353.             }

  354.         } else {

  355.             for (j=0; j<filterSize; j++)

  356.                 filter2[i*filter2Size + j]= filter[i*filterSize + j];

  357.         }

  358.         //FIXME dstFilter

  359. 

  360.         (*filterPos)[i]+= (filterSize-1)/2 - (filter2Size-1)/2;

  361.     }

  362.     av_freep(&filter);

  363. 

  364.     /* try to reduce the filter-size (step1 find size and shift left) */

  365.     // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).

  366.     minFilterSize= 0;

  367.     for (i=dstW-1; i>=0; i--) {

  368.         int min= filter2Size;

  369.         int j;

  370.         int64_t cutOff=0.0;

  371. 

  372.         /* get rid of near zero elements on the left by shifting left */

  373.         for (j=0; j<filter2Size; j++) {

  374.             int k;

  375.             cutOff += FFABS(filter2[i*filter2Size]);

  376. 

  377.             if (cutOff > SWS_MAX_REDUCE_CUTOFF*fone) break;

  378. 

  379.             /* preserve monotonicity because the core can't handle the filter otherwise */

  380.             if (i<dstW-1 && (*filterPos)[i] >= (*filterPos)[i+1]) break;

  381. 

  382.             // move filter coefficients left

  383.             for (k=1; k<filter2Size; k++)

  384.                 filter2[i*filter2Size + k - 1]= filter2[i*filter2Size + k];

  385.             filter2[i*filter2Size + k - 1]= 0;

  386.             (*filterPos)[i]++;

  387.         }

  388. 

  389.         cutOff=0;

  390.         /* count near zeros on the right */

  391.         for (j=filter2Size-1; j>0; j--) {

  392.             cutOff += FFABS(filter2[i*filter2Size + j]);

  393. 

  394.             if (cutOff > SWS_MAX_REDUCE_CUTOFF*fone) break;

  395.             min--;

  396.         }

  397. 

  398.         if (min>minFilterSize) minFilterSize= min;

  399.     }

  400. 

  401.     if (flags & SWS_CPU_CAPS_ALTIVEC) {

  402.         // we can handle the special case 4,

  403.         // so we don't want to go to the full 8

  404.         if (minFilterSize < 5)

  405.             filterAlign = 4;

  406. 

  407.         // We really don't want to waste our time

  408.         // doing useless computation, so fall back on

  409.         // the scalar C code for very small filters.

  410.         // Vectorizing is worth it only if you have a

  411.         // decent-sized vector.

  412.         if (minFilterSize < 3)

  413.             filterAlign = 1;

  414.     }

  415. 

  416.     if (flags & SWS_CPU_CAPS_MMX) {

  417.         // special case for unscaled vertical filtering

  418.         if (minFilterSize == 1 && filterAlign == 2)

  419.             filterAlign= 1;

  420.     }

  421. 

  422.     assert(minFilterSize > 0);

  423.     filterSize= (minFilterSize +(filterAlign-1)) & (~(filterAlign-1));

  424.     assert(filterSize > 0);

  425.     filter= av_malloc(filterSize*dstW*sizeof(*filter));

  426.     if (filterSize >= MAX_FILTER_SIZE*16/((flags&SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter)

  427.         goto fail;

  428.     *outFilterSize= filterSize;

  429. 

  430.     if (flags&SWS_PRINT_INFO)

  431.         av_log(NULL, AV_LOG_VERBOSE, "SwScaler: reducing / aligning filtersize %d -> %d\n", filter2Size, filterSize);

  432.     /* try to reduce the filter-size (step2 reduce it) */

  433.     for (i=0; i<dstW; i++) {

  434.         int j;

  435. 

  436.         for (j=0; j<filterSize; j++) {

  437.             if (j>=filter2Size) filter[i*filterSize + j]= 0;

  438.             else               filter[i*filterSize + j]= filter2[i*filter2Size + j];

  439.             if((flags & SWS_BITEXACT) && j>=minFilterSize)

  440.                 filter[i*filterSize + j]= 0;

  441.         }

  442.     }

  443. 

  444.     //FIXME try to align filterPos if possible

  445. 

  446.     //fix borders

  447.     for (i=0; i<dstW; i++) {

  448.         int j;

  449.         if ((*filterPos)[i] < 0) {

  450.             // move filter coefficients left to compensate for filterPos

  451.             for (j=1; j<filterSize; j++) {

  452.                 int left= FFMAX(j + (*filterPos)[i], 0);

  453.                 filter[i*filterSize + left] += filter[i*filterSize + j];

  454.                 filter[i*filterSize + j]=0;

  455.             }

  456.             (*filterPos)[i]= 0;

  457.         }

  458. 

  459.         if ((*filterPos)[i] + filterSize > srcW) {

  460.             int shift= (*filterPos)[i] + filterSize - srcW;

  461.             // move filter coefficients right to compensate for filterPos

  462.             for (j=filterSize-2; j>=0; j--) {

  463.                 int right= FFMIN(j + shift, filterSize-1);

  464.                 filter[i*filterSize +right] += filter[i*filterSize +j];

  465.                 filter[i*filterSize +j]=0;

  466.             }

  467.             (*filterPos)[i]= srcW - filterSize;

  468.         }

  469.     }

  470. 

  471.     // Note the +1 is for the MMX scaler which reads over the end

  472.     /* align at 16 for AltiVec (needed by hScale_altivec_real) */

  473.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter, *outFilterSize*(dstW+1)*sizeof(int16_t), fail);

  474. 

  475.     /* normalize & store in outFilter */

  476.     for (i=0; i<dstW; i++) {

  477.         int j;

  478.         int64_t error=0;

  479.         int64_t sum=0;

  480. 

  481.         for (j=0; j<filterSize; j++) {

  482.             sum+= filter[i*filterSize + j];

  483.         }

  484.         sum= (sum + one/2)/ one;

  485.         for (j=0; j<*outFilterSize; j++) {

  486.             int64_t v= filter[i*filterSize + j] + error;

  487.             int intV= ROUNDED_DIV(v, sum);

  488.             (*outFilter)[i*(*outFilterSize) + j]= intV;

  489.             error= v - intV*sum;

  490.         }

  491.     }

  492. 

  493.     (*filterPos)[dstW]= (*filterPos)[dstW-1]; // the MMX scaler will read over the end

  494.     for (i=0; i<*outFilterSize; i++) {

  495.         int j= dstW*(*outFilterSize);

  496.         (*outFilter)[j + i]= (*outFilter)[j + i - (*outFilterSize)];

  497.     }

  498. 

  499.     ret=0;

  500. fail:

  501.     av_free(filter);

  502.     av_free(filter2);

  503.     return ret;

  504. }

  505. 

  506. #if ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL

  507. static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode, int16_t *filter, int32_t *filterPos, int numSplits)

  508. {

  509.     uint8_t *fragmentA;

  510.     x86_reg imm8OfPShufW1A;

  511.     x86_reg imm8OfPShufW2A;

  512.     x86_reg fragmentLengthA;

  513.     uint8_t *fragmentB;

  514.     x86_reg imm8OfPShufW1B;

  515.     x86_reg imm8OfPShufW2B;

  516.     x86_reg fragmentLengthB;

  517.     int fragmentPos;

  518. 

  519.     int xpos, i;

  520. 

  521.     // create an optimized horizontal scaling routine

  522.     /* This scaler is made of runtime-generated MMX2 code using specially

  523.      * tuned pshufw instructions. For every four output pixels, if four

  524.      * input pixels are enough for the fast bilinear scaling, then a chunk

  525.      * of fragmentB is used. If five input pixels are needed, then a chunk

  526.      * of fragmentA is used.

  527.      */

  528. 

  529.     //code fragment

  530. 

  531.     __asm__ volatile(

  532.         "jmp                         9f                 \n\t"

  533.     // Begin

  534.         "0:                                             \n\t"

  535.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  536.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  537.         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"

  538.         "punpcklbw                %%mm7, %%mm1          \n\t"

  539.         "punpcklbw                %%mm7, %%mm0          \n\t"

  540.         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"

  541.         "1:                                             \n\t"

  542.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  543.         "2:                                             \n\t"

  544.         "psubw                    %%mm1, %%mm0          \n\t"

  545.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  546.         "pmullw                   %%mm3, %%mm0          \n\t"

  547.         "psllw                       $7, %%mm1          \n\t"

  548.         "paddw                    %%mm1, %%mm0          \n\t"

  549. 

  550.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  551. 

  552.         "add                         $8, %%"REG_a"      \n\t"

  553.     // End

  554.         "9:                                             \n\t"

  555. //        "int $3                                         \n\t"

  556.         "lea                 " LOCAL_MANGLE(0b) ", %0   \n\t"

  557.         "lea                 " LOCAL_MANGLE(1b) ", %1   \n\t"

  558.         "lea                 " LOCAL_MANGLE(2b) ", %2   \n\t"

  559.         "dec                         %1                 \n\t"

  560.         "dec                         %2                 \n\t"

  561.         "sub                         %0, %1             \n\t"

  562.         "sub                         %0, %2             \n\t"

  563.         "lea                 " LOCAL_MANGLE(9b) ", %3   \n\t"

  564.         "sub                         %0, %3             \n\t"

  565. 

  566. 

  567.         :"=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),

  568.         "=r" (fragmentLengthA)

  569.     );

  570. 

  571.     __asm__ volatile(

  572.         "jmp                         9f                 \n\t"

  573.     // Begin

  574.         "0:                                             \n\t"

  575.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  576.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  577.         "punpcklbw                %%mm7, %%mm0          \n\t"

  578.         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"

  579.         "1:                                             \n\t"

  580.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  581.         "2:                                             \n\t"

  582.         "psubw                    %%mm1, %%mm0          \n\t"

  583.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  584.         "pmullw                   %%mm3, %%mm0          \n\t"

  585.         "psllw                       $7, %%mm1          \n\t"

  586.         "paddw                    %%mm1, %%mm0          \n\t"

  587. 

  588.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  589. 

  590.         "add                         $8, %%"REG_a"      \n\t"

  591.     // End

  592.         "9:                                             \n\t"

  593. //        "int                       $3                   \n\t"

  594.         "lea                 " LOCAL_MANGLE(0b) ", %0   \n\t"

  595.         "lea                 " LOCAL_MANGLE(1b) ", %1   \n\t"

  596.         "lea                 " LOCAL_MANGLE(2b) ", %2   \n\t"

  597.         "dec                         %1                 \n\t"

  598.         "dec                         %2                 \n\t"

  599.         "sub                         %0, %1             \n\t"

  600.         "sub                         %0, %2             \n\t"

  601.         "lea                 " LOCAL_MANGLE(9b) ", %3   \n\t"

  602.         "sub                         %0, %3             \n\t"

  603. 

  604. 

  605.         :"=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),

  606.         "=r" (fragmentLengthB)

  607.     );

  608. 

  609.     xpos= 0; //lumXInc/2 - 0x8000; // difference between pixel centers

  610.     fragmentPos=0;

  611. 

  612.     for (i=0; i<dstW/numSplits; i++) {

  613.         int xx=xpos>>16;

  614. 

  615.         if ((i&3) == 0) {

  616.             int a=0;

  617.             int b=((xpos+xInc)>>16) - xx;

  618.             int c=((xpos+xInc*2)>>16) - xx;

  619.             int d=((xpos+xInc*3)>>16) - xx;

  620.             int inc                = (d+1<4);

  621.             uint8_t *fragment      = (d+1<4) ? fragmentB       : fragmentA;

  622.             x86_reg imm8OfPShufW1  = (d+1<4) ? imm8OfPShufW1B  : imm8OfPShufW1A;

  623.             x86_reg imm8OfPShufW2  = (d+1<4) ? imm8OfPShufW2B  : imm8OfPShufW2A;

  624.             x86_reg fragmentLength = (d+1<4) ? fragmentLengthB : fragmentLengthA;

  625.             int maxShift= 3-(d+inc);

  626.             int shift=0;

  627. 

  628.             if (filterCode) {

  629.                 filter[i  ] = (( xpos         & 0xFFFF) ^ 0xFFFF)>>9;

  630.                 filter[i+1] = (((xpos+xInc  ) & 0xFFFF) ^ 0xFFFF)>>9;

  631.                 filter[i+2] = (((xpos+xInc*2) & 0xFFFF) ^ 0xFFFF)>>9;

  632.                 filter[i+3] = (((xpos+xInc*3) & 0xFFFF) ^ 0xFFFF)>>9;

  633.                 filterPos[i/2]= xx;

  634. 

  635.                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);

  636. 

  637.                 filterCode[fragmentPos + imm8OfPShufW1]=

  638.                     (a+inc) | ((b+inc)<<2) | ((c+inc)<<4) | ((d+inc)<<6);

  639.                 filterCode[fragmentPos + imm8OfPShufW2]=

  640.                     a | (b<<2) | (c<<4) | (d<<6);

  641. 

  642.                 if (i+4-inc>=dstW) shift=maxShift; //avoid overread

  643.                 else if ((filterPos[i/2]&3) <= maxShift) shift=filterPos[i/2]&3; //Align

  644. 

  645.                 if (shift && i>=shift) {

  646.                     filterCode[fragmentPos + imm8OfPShufW1]+= 0x55*shift;

  647.                     filterCode[fragmentPos + imm8OfPShufW2]+= 0x55*shift;

  648.                     filterPos[i/2]-=shift;

  649.                 }

  650.             }

  651. 

  652.             fragmentPos+= fragmentLength;

  653. 

  654.             if (filterCode)

  655.                 filterCode[fragmentPos]= RET;

  656.         }

  657.         xpos+=xInc;

  658.     }

  659.     if (filterCode)

  660.         filterPos[((i/2)+1)&(~1)]= xpos>>16; // needed to jump to the next part

  661. 

  662.     return fragmentPos + 1;

  663. }

  664. #endif /* ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL */

  665. 

  666. static void getSubSampleFactors(int *h, int *v, enum PixelFormat format)

  667. {

  668.     *h = av_pix_fmt_descriptors[format].log2_chroma_w;

  669.     *v = av_pix_fmt_descriptors[format].log2_chroma_h;

  670. }

  671. 

  672. static uint16_t roundToInt16(int64_t f)

  673. {

  674.     int r= (f + (1<<15))>>16;

  675.          if (r<-0x7FFF) return 0x8000;

  676.     else if (r> 0x7FFF) return 0x7FFF;

  677.     else                return r;

  678. }

  679. 

  680. int sws_setColorspaceDetails(SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)

  681. {

  682.     int64_t crv =  inv_table[0];

  683.     int64_t cbu =  inv_table[1];

  684.     int64_t cgu = -inv_table[2];

  685.     int64_t cgv = -inv_table[3];

  686.     int64_t cy  = 1<<16;

  687.     int64_t oy  = 0;

  688. 

  689.     memcpy(c->srcColorspaceTable, inv_table, sizeof(int)*4);

  690.     memcpy(c->dstColorspaceTable,     table, sizeof(int)*4);

  691. 

  692.     c->brightness= brightness;

  693.     c->contrast  = contrast;

  694.     c->saturation= saturation;

  695.     c->srcRange  = srcRange;

  696.     c->dstRange  = dstRange;

  697.     if (isYUV(c->dstFormat) || isGray(c->dstFormat)) return -1;

  698. 

  699.     c->uOffset=   0x0400040004000400LL;

  700.     c->vOffset=   0x0400040004000400LL;

  701. 

  702.     if (!srcRange) {

  703.         cy= (cy*255) / 219;

  704.         oy= 16<<16;

  705.     } else {

  706.         crv= (crv*224) / 255;

  707.         cbu= (cbu*224) / 255;

  708.         cgu= (cgu*224) / 255;

  709.         cgv= (cgv*224) / 255;

  710.     }

  711. 

  712.     cy = (cy *contrast             )>>16;

  713.     crv= (crv*contrast * saturation)>>32;

  714.     cbu= (cbu*contrast * saturation)>>32;

  715.     cgu= (cgu*contrast * saturation)>>32;

  716.     cgv= (cgv*contrast * saturation)>>32;

  717. 

  718.     oy -= 256*brightness;

  719. 

  720.     c->yCoeff=    roundToInt16(cy *8192) * 0x0001000100010001ULL;

  721.     c->vrCoeff=   roundToInt16(crv*8192) * 0x0001000100010001ULL;

  722.     c->ubCoeff=   roundToInt16(cbu*8192) * 0x0001000100010001ULL;

  723.     c->vgCoeff=   roundToInt16(cgv*8192) * 0x0001000100010001ULL;

  724.     c->ugCoeff=   roundToInt16(cgu*8192) * 0x0001000100010001ULL;

  725.     c->yOffset=   roundToInt16(oy *   8) * 0x0001000100010001ULL;

  726. 

  727.     c->yuv2rgb_y_coeff  = (int16_t)roundToInt16(cy <<13);

  728.     c->yuv2rgb_y_offset = (int16_t)roundToInt16(oy << 9);

  729.     c->yuv2rgb_v2r_coeff= (int16_t)roundToInt16(crv<<13);

  730.     c->yuv2rgb_v2g_coeff= (int16_t)roundToInt16(cgv<<13);

  731.     c->yuv2rgb_u2g_coeff= (int16_t)roundToInt16(cgu<<13);

  732.     c->yuv2rgb_u2b_coeff= (int16_t)roundToInt16(cbu<<13);

  733. 

  734.     ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness, contrast, saturation);

  735.     //FIXME factorize

  736. 

  737. #if ARCH_PPC && (HAVE_ALTIVEC || CONFIG_RUNTIME_CPUDETECT)

  738.     if (c->flags & SWS_CPU_CAPS_ALTIVEC)

  739.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness, contrast, saturation);

  740. #endif

  741.     return 0;

  742. }

  743. 

  744. int sws_getColorspaceDetails(SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)

  745. {

  746.     if (isYUV(c->dstFormat) || isGray(c->dstFormat)) return -1;

  747. 

  748.     *inv_table = c->srcColorspaceTable;

  749.     *table     = c->dstColorspaceTable;

  750.     *srcRange  = c->srcRange;

  751.     *dstRange  = c->dstRange;

  752.     *brightness= c->brightness;

  753.     *contrast  = c->contrast;

  754.     *saturation= c->saturation;

  755. 

  756.     return 0;

  757. }

  758. 

  759. static int handle_jpeg(enum PixelFormat *format)

  760. {

  761.     switch (*format) {

  762.     case PIX_FMT_YUVJ420P:

  763.         *format = PIX_FMT_YUV420P;

  764.         return 1;

  765.     case PIX_FMT_YUVJ422P:

  766.         *format = PIX_FMT_YUV422P;

  767.         return 1;

  768.     case PIX_FMT_YUVJ444P:

  769.         *format = PIX_FMT_YUV444P;

  770.         return 1;

  771.     case PIX_FMT_YUVJ440P:

  772.         *format = PIX_FMT_YUV440P;

  773.         return 1;

  774.     default:

  775.         return 0;

  776.     }

  777. }

  778. 

  779. SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,

  780.                            int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  781.                            SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  782. {

  783. 

  784.     SwsContext *c;

  785.     int i;

  786.     int usesVFilter, usesHFilter;

  787.     int unscaled;

  788.     int srcRange, dstRange;

  789.     SwsFilter dummyFilter= {NULL, NULL, NULL, NULL};

  790. #if ARCH_X86

  791.     if (flags & SWS_CPU_CAPS_MMX)

  792.         __asm__ volatile("emms\n\t"::: "memory");

  793. #endif

  794. 

  795. #if !CONFIG_RUNTIME_CPUDETECT //ensure that the flags match the compiled variant if cpudetect is off

  796.     flags &= ~(SWS_CPU_CAPS_MMX|SWS_CPU_CAPS_MMX2|SWS_CPU_CAPS_3DNOW|SWS_CPU_CAPS_ALTIVEC|SWS_CPU_CAPS_BFIN);

  797.     flags |= ff_hardcodedcpuflags();

  798. #endif /* CONFIG_RUNTIME_CPUDETECT */

  799.     if (!rgb15to16) sws_rgb2rgb_init(flags);

  800. 

  801.     unscaled = (srcW == dstW && srcH == dstH);

  802. 

  803.     srcRange = handle_jpeg(&srcFormat);

  804.     dstRange = handle_jpeg(&dstFormat);

  805. 

  806.     if (!isSupportedIn(srcFormat)) {

  807.         av_log(NULL, AV_LOG_ERROR, "swScaler: %s is not supported as input pixel format\n", sws_format_name(srcFormat));

  808.         return NULL;

  809.     }

  810.     if (!isSupportedOut(dstFormat)) {

  811.         av_log(NULL, AV_LOG_ERROR, "swScaler: %s is not supported as output pixel format\n", sws_format_name(dstFormat));

  812.         return NULL;

  813.     }

  814. 

  815.     i= flags & ( SWS_POINT

  816.                 |SWS_AREA

  817.                 |SWS_BILINEAR

  818.                 |SWS_FAST_BILINEAR

  819.                 |SWS_BICUBIC

  820.                 |SWS_X

  821.                 |SWS_GAUSS

  822.                 |SWS_LANCZOS

  823.                 |SWS_SINC

  824.                 |SWS_SPLINE

  825.                 |SWS_BICUBLIN);

  826.     if(!i || (i & (i-1))) {

  827.         av_log(NULL, AV_LOG_ERROR, "swScaler: Exactly one scaler algorithm must be chosen\n");

  828.         return NULL;

  829.     }

  830. 

  831.     /* sanity check */

  832.     if (srcW<4 || srcH<1 || dstW<8 || dstH<1) { //FIXME check if these are enough and try to lowwer them after fixing the relevant parts of the code

  833.         av_log(NULL, AV_LOG_ERROR, "swScaler: %dx%d -> %dx%d is invalid scaling dimension\n",

  834.                srcW, srcH, dstW, dstH);

  835.         return NULL;

  836.     }

  837.     if(srcW > VOFW || dstW > VOFW) {

  838.         av_log(NULL, AV_LOG_ERROR, "swScaler: Compile-time maximum width is "AV_STRINGIFY(VOFW)" change VOF/VOFW and recompile\n");

  839.         return NULL;

  840.     }

  841. 

  842.     if (!dstFilter) dstFilter= &dummyFilter;

  843.     if (!srcFilter) srcFilter= &dummyFilter;

  844. 

  845.     FF_ALLOCZ_OR_GOTO(NULL, c, sizeof(SwsContext), fail);

  846. 

  847.     c->av_class = &sws_context_class;

  848.     c->srcW= srcW;

  849.     c->srcH= srcH;

  850.     c->dstW= dstW;

  851.     c->dstH= dstH;

  852.     c->lumXInc= ((srcW<<16) + (dstW>>1))/dstW;

  853.     c->lumYInc= ((srcH<<16) + (dstH>>1))/dstH;

  854.     c->flags= flags;

  855.     c->dstFormat= dstFormat;

  856.     c->srcFormat= srcFormat;

  857.     c->dstFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[dstFormat]);

  858.     c->srcFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[srcFormat]);

  859.     c->vRounder= 4* 0x0001000100010001ULL;

  860. 

  861.     usesHFilter= usesVFilter= 0;

  862.     if (dstFilter->lumV && dstFilter->lumV->length>1) usesVFilter=1;

  863.     if (dstFilter->lumH && dstFilter->lumH->length>1) usesHFilter=1;

  864.     if (dstFilter->chrV && dstFilter->chrV->length>1) usesVFilter=1;

  865.     if (dstFilter->chrH && dstFilter->chrH->length>1) usesHFilter=1;

  866.     if (srcFilter->lumV && srcFilter->lumV->length>1) usesVFilter=1;

  867.     if (srcFilter->lumH && srcFilter->lumH->length>1) usesHFilter=1;

  868.     if (srcFilter->chrV && srcFilter->chrV->length>1) usesVFilter=1;

  869.     if (srcFilter->chrH && srcFilter->chrH->length>1) usesHFilter=1;

  870. 

  871.     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);

  872.     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);

  873. 

  874.     // reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation

  875.     if ((isBGR(dstFormat) || isRGB(dstFormat)) && !(flags&SWS_FULL_CHR_H_INT)) c->chrDstHSubSample=1;

  876. 

  877.     // drop some chroma lines if the user wants it

  878.     c->vChrDrop= (flags&SWS_SRC_V_CHR_DROP_MASK)>>SWS_SRC_V_CHR_DROP_SHIFT;

  879.     c->chrSrcVSubSample+= c->vChrDrop;

  880. 

  881.     // drop every other pixel for chroma calculation unless user wants full chroma

  882.     if ((isBGR(srcFormat) || isRGB(srcFormat)) && !(flags&SWS_FULL_CHR_H_INP)

  883.       && srcFormat!=PIX_FMT_RGB8      && srcFormat!=PIX_FMT_BGR8

  884.       && srcFormat!=PIX_FMT_RGB4      && srcFormat!=PIX_FMT_BGR4

  885.       && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE

  886.       && ((dstW>>c->chrDstHSubSample) <= (srcW>>1) || (flags&(SWS_FAST_BILINEAR|SWS_POINT))))

  887.         c->chrSrcHSubSample=1;

  888. 

  889.     if (param) {

  890.         c->param[0] = param[0];

  891.         c->param[1] = param[1];

  892.     } else {

  893.         c->param[0] =

  894.         c->param[1] = SWS_PARAM_DEFAULT;

  895.     }

  896. 

  897.     // Note the -((-x)>>y) is so that we always round toward +inf.

  898.     c->chrSrcW= -((-srcW) >> c->chrSrcHSubSample);

  899.     c->chrSrcH= -((-srcH) >> c->chrSrcVSubSample);

  900.     c->chrDstW= -((-dstW) >> c->chrDstHSubSample);

  901.     c->chrDstH= -((-dstH) >> c->chrDstVSubSample);

  902. 

  903.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], srcRange, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/, dstRange, 0, 1<<16, 1<<16);

  904. 

  905.     /* unscaled special cases */

  906.     if (unscaled && !usesHFilter && !usesVFilter && (srcRange == dstRange || isBGR(dstFormat) || isRGB(dstFormat))) {

  907.         ff_get_unscaled_swscale(c);

  908. 

  909.         if (c->swScale) {

  910.             if (flags&SWS_PRINT_INFO)

  911.                 av_log(c, AV_LOG_INFO, "using unscaled %s -> %s special converter\n",

  912.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  913.             return c;

  914.         }

  915.     }

  916. 

  917.     if (flags & SWS_CPU_CAPS_MMX2) {

  918.         c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 : 0;

  919.         if (!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && (flags&SWS_FAST_BILINEAR)) {

  920.             if (flags&SWS_PRINT_INFO)

  921.                 av_log(c, AV_LOG_INFO, "output width is not a multiple of 32 -> no MMX2 scaler\n");

  922.         }

  923.         if (usesHFilter) c->canMMX2BeUsed=0;

  924.     }

  925.     else

  926.         c->canMMX2BeUsed=0;

  927. 

  928.     c->chrXInc= ((c->chrSrcW<<16) + (c->chrDstW>>1))/c->chrDstW;

  929.     c->chrYInc= ((c->chrSrcH<<16) + (c->chrDstH>>1))/c->chrDstH;

  930. 

  931.     // match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src to pixel n-2 of dst

  932.     // but only for the FAST_BILINEAR mode otherwise do correct scaling

  933.     // n-2 is the last chrominance sample available

  934.     // this is not perfect, but no one should notice the difference, the more correct variant

  935.     // would be like the vertical one, but that would require some special code for the

  936.     // first and last pixel

  937.     if (flags&SWS_FAST_BILINEAR) {

  938.         if (c->canMMX2BeUsed) {

  939.             c->lumXInc+= 20;

  940.             c->chrXInc+= 20;

  941.         }

  942.         //we don't use the x86 asm scaler if MMX is available

  943.         else if (flags & SWS_CPU_CAPS_MMX) {

  944.             c->lumXInc = ((srcW-2)<<16)/(dstW-2) - 20;

  945.             c->chrXInc = ((c->chrSrcW-2)<<16)/(c->chrDstW-2) - 20;

  946.         }

  947.     }

  948. 

  949.     /* precalculate horizontal scaler filter coefficients */

  950.     {

  951. #if ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL

  952. // can't downscale !!!

  953.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  954.             c->lumMmx2FilterCodeSize = initMMX2HScaler(      dstW, c->lumXInc, NULL, NULL, NULL, 8);

  955.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc, NULL, NULL, NULL, 4);

  956. 

  957. #ifdef MAP_ANONYMOUS

  958.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);

  959.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);

  960. #elif HAVE_VIRTUALALLOC

  961.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  962.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  963. #else

  964.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  965.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  966. #endif

  967. 

  968.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter   , (dstW        /8+8)*sizeof(int16_t), fail);

  969.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter   , (c->chrDstW  /4+8)*sizeof(int16_t), fail);

  970.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW      /2/8+8)*sizeof(int32_t), fail);

  971.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW/2/4+8)*sizeof(int32_t), fail);

  972. 

  973.             initMMX2HScaler(      dstW, c->lumXInc, c->lumMmx2FilterCode, c->hLumFilter, c->hLumFilterPos, 8);

  974.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode, c->hChrFilter, c->hChrFilterPos, 4);

  975. 

  976. #ifdef MAP_ANONYMOUS

  977.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  978.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  979. #endif

  980.         } else

  981. #endif /* ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) && CONFIG_GPL */

  982.         {

  983.             const int filterAlign=

  984.                 (flags & SWS_CPU_CAPS_MMX) ? 4 :

  985.                 (flags & SWS_CPU_CAPS_ALTIVEC) ? 8 :

  986.                 1;

  987. 

  988.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos, &c->hLumFilterSize, c->lumXInc,

  989.                            srcW      ,       dstW, filterAlign, 1<<14,

  990.                            (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC)  : flags,

  991.                            srcFilter->lumH, dstFilter->lumH, c->param) < 0)

  992.                 goto fail;

  993.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos, &c->hChrFilterSize, c->chrXInc,

  994.                            c->chrSrcW, c->chrDstW, filterAlign, 1<<14,

  995.                            (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags,

  996.                            srcFilter->chrH, dstFilter->chrH, c->param) < 0)

  997.                 goto fail;

  998.         }

  999.     } // initialize horizontal stuff

  1000. 

  1001.     /* precalculate vertical scaler filter coefficients */

  1002.     {

  1003.         const int filterAlign=

  1004.             (flags & SWS_CPU_CAPS_MMX) && (flags & SWS_ACCURATE_RND) ? 2 :

  1005.             (flags & SWS_CPU_CAPS_ALTIVEC) ? 8 :

  1006.             1;

  1007. 

  1008.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize, c->lumYInc,

  1009.                        srcH      ,        dstH, filterAlign, (1<<12),

  1010.                        (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC)  : flags,

  1011.                        srcFilter->lumV, dstFilter->lumV, c->param) < 0)

  1012.             goto fail;

  1013.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize, c->chrYInc,

  1014.                        c->chrSrcH, c->chrDstH, filterAlign, (1<<12),

  1015.                        (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags,

  1016.                        srcFilter->chrV, dstFilter->chrV, c->param) < 0)

  1017.             goto fail;

  1018. 

  1019. #if ARCH_PPC && (HAVE_ALTIVEC || CONFIG_RUNTIME_CPUDETECT)

  1020.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof (vector signed short)*c->vLumFilterSize*c->dstH, fail);

  1021.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof (vector signed short)*c->vChrFilterSize*c->chrDstH, fail);

  1022. 

  1023.         for (i=0;i<c->vLumFilterSize*c->dstH;i++) {

  1024.             int j;

  1025.             short *p = (short *)&c->vYCoeffsBank[i];

  1026.             for (j=0;j<8;j++)

  1027.                 p[j] = c->vLumFilter[i];

  1028.         }

  1029. 

  1030.         for (i=0;i<c->vChrFilterSize*c->chrDstH;i++) {

  1031.             int j;

  1032.             short *p = (short *)&c->vCCoeffsBank[i];

  1033.             for (j=0;j<8;j++)

  1034.                 p[j] = c->vChrFilter[i];

  1035.         }

  1036. #endif

  1037.     }

  1038. 

  1039.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1040.     c->vLumBufSize= c->vLumFilterSize;

  1041.     c->vChrBufSize= c->vChrFilterSize;

  1042.     for (i=0; i<dstH; i++) {

  1043.         int chrI= i*c->chrDstH / dstH;

  1044.         int nextSlice= FFMAX(c->vLumFilterPos[i   ] + c->vLumFilterSize - 1,

  1045.                            ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<c->chrSrcVSubSample));

  1046. 

  1047.         nextSlice>>= c->chrSrcVSubSample;

  1048.         nextSlice<<= c->chrSrcVSubSample;

  1049.         if (c->vLumFilterPos[i   ] + c->vLumBufSize < nextSlice)

  1050.             c->vLumBufSize= nextSlice - c->vLumFilterPos[i];

  1051.         if (c->vChrFilterPos[chrI] + c->vChrBufSize < (nextSlice>>c->chrSrcVSubSample))

  1052.             c->vChrBufSize= (nextSlice>>c->chrSrcVSubSample) - c->vChrFilterPos[chrI];

  1053.     }

  1054. 

  1055.     // allocate pixbufs (we use dynamic allocation because otherwise we would need to

  1056.     // allocate several megabytes to handle all possible cases)

  1057.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);

  1058.     FF_ALLOC_OR_GOTO(c, c->chrPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail);

  1059.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1060.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);

  1061.     //Note we need at least one pixel more at the end because of the MMX code (just in case someone wanna replace the 4000/8000)

  1062.     /* align at 16 bytes for AltiVec */

  1063.     for (i=0; i<c->vLumBufSize; i++) {

  1064.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i+c->vLumBufSize], VOF+1, fail);

  1065.         c->lumPixBuf[i] = c->lumPixBuf[i+c->vLumBufSize];

  1066.     }

  1067.     for (i=0; i<c->vChrBufSize; i++) {

  1068.         FF_ALLOC_OR_GOTO(c, c->chrPixBuf[i+c->vChrBufSize], (VOF+1)*2, fail);

  1069.         c->chrPixBuf[i] = c->chrPixBuf[i+c->vChrBufSize];

  1070.     }

  1071.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1072.         for (i=0; i<c->vLumBufSize; i++) {

  1073.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i+c->vLumBufSize], VOF+1, fail);

  1074.             c->alpPixBuf[i] = c->alpPixBuf[i+c->vLumBufSize];

  1075.         }

  1076. 

  1077.     //try to avoid drawing green stuff between the right end and the stride end

  1078.     for (i=0; i<c->vChrBufSize; i++) memset(c->chrPixBuf[i], 64, (VOF+1)*2);

  1079. 

  1080.     assert(2*VOFW == VOF);

  1081. 

  1082.     assert(c->chrDstH <= dstH);

  1083. 

  1084.     if (flags&SWS_PRINT_INFO) {

  1085.         if (flags&SWS_FAST_BILINEAR)

  1086.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1087.         else if (flags&SWS_BILINEAR)

  1088.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1089.         else if (flags&SWS_BICUBIC)

  1090.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1091.         else if (flags&SWS_X)

  1092.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1093.         else if (flags&SWS_POINT)

  1094.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1095.         else if (flags&SWS_AREA)

  1096.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1097.         else if (flags&SWS_BICUBLIN)

  1098.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1099.         else if (flags&SWS_GAUSS)

  1100.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1101.         else if (flags&SWS_SINC)

  1102.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1103.         else if (flags&SWS_LANCZOS)

  1104.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1105.         else if (flags&SWS_SPLINE)

  1106.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1107.         else

  1108.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1109. 

  1110.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1111.                sws_format_name(srcFormat),

  1112. #ifdef DITHER1XBPP

  1113.                dstFormat == PIX_FMT_BGR555 || dstFormat == PIX_FMT_BGR565 ? "dithered " : "",

  1114. #else

  1115.                "",

  1116. #endif

  1117.                sws_format_name(dstFormat));

  1118. 

  1119.         if (flags & SWS_CPU_CAPS_MMX2)

  1120.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1121.         else if (flags & SWS_CPU_CAPS_3DNOW)

  1122.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1123.         else if (flags & SWS_CPU_CAPS_MMX)

  1124.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1125.         else if (flags & SWS_CPU_CAPS_ALTIVEC)

  1126.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1127.         else

  1128.             av_log(c, AV_LOG_INFO, "using C\n");

  1129.     }

  1130. 

  1131.     if (flags & SWS_PRINT_INFO) {

  1132.         if (flags & SWS_CPU_CAPS_MMX) {

  1133.             if (c->canMMX2BeUsed && (flags&SWS_FAST_BILINEAR))

  1134.                 av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR MMX2 scaler for horizontal scaling\n");

  1135.             else {

  1136.                 if (c->hLumFilterSize==4)

  1137.                     av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal luminance scaling\n");

  1138.                 else if (c->hLumFilterSize==8)

  1139.                     av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal luminance scaling\n");

  1140.                 else

  1141.                     av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal luminance scaling\n");

  1142. 

  1143.                 if (c->hChrFilterSize==4)

  1144.                     av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal chrominance scaling\n");

  1145.                 else if (c->hChrFilterSize==8)

  1146.                     av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal chrominance scaling\n");

  1147.                 else

  1148.                     av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal chrominance scaling\n");

  1149.             }

  1150.         } else {

  1151. #if ARCH_X86

  1152.             av_log(c, AV_LOG_VERBOSE, "using x86 asm scaler for horizontal scaling\n");

  1153. #else

  1154.             if (flags & SWS_FAST_BILINEAR)

  1155.                 av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR C scaler for horizontal scaling\n");

  1156.             else

  1157.                 av_log(c, AV_LOG_VERBOSE, "using C scaler for horizontal scaling\n");

  1158. #endif

  1159.         }

  1160.         if (isPlanarYUV(dstFormat)) {

  1161.             if (c->vLumFilterSize==1)

  1162.                 av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical scaling (YV12 like)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1163.             else

  1164.                 av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (YV12 like)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1165.         } else {

  1166.             if (c->vLumFilterSize==1 && c->vChrFilterSize==2)

  1167.                 av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical luminance scaling (BGR)\n"

  1168.                        "      2-tap scaler for vertical chrominance scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1169.             else if (c->vLumFilterSize==2 && c->vChrFilterSize==2)

  1170.                 av_log(c, AV_LOG_VERBOSE, "using 2-tap linear %s scaler for vertical scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1171.             else

  1172.                 av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1173.         }

  1174. 

  1175.         if (dstFormat==PIX_FMT_BGR24)

  1176.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR24 converter\n",

  1177.                    (flags & SWS_CPU_CAPS_MMX2) ? "MMX2" : ((flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C"));

  1178.         else if (dstFormat==PIX_FMT_RGB32)

  1179.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR32 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1180.         else if (dstFormat==PIX_FMT_BGR565)

  1181.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR16 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1182.         else if (dstFormat==PIX_FMT_BGR555)

  1183.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR15 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1184. 

  1185.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1186.         av_log(c, AV_LOG_DEBUG, "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1187.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1188.         av_log(c, AV_LOG_DEBUG, "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1189.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH, c->chrXInc, c->chrYInc);

  1190.     }

  1191. 

  1192.     c->swScale= ff_getSwsFunc(c);

  1193.     return c;

  1194. 

  1195. fail:

  1196.     sws_freeContext(c);

  1197.     return NULL;

  1198. }

  1199. 

  1200. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1201.                                 float lumaSharpen, float chromaSharpen,

  1202.                                 float chromaHShift, float chromaVShift,

  1203.                                 int verbose)

  1204. {

  1205.     SwsFilter *filter= av_malloc(sizeof(SwsFilter));

  1206.     if (!filter)

  1207.         return NULL;

  1208. 

  1209.     if (lumaGBlur!=0.0) {

  1210.         filter->lumH= sws_getGaussianVec(lumaGBlur, 3.0);

  1211.         filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);

  1212.     } else {

  1213.         filter->lumH= sws_getIdentityVec();

  1214.         filter->lumV= sws_getIdentityVec();

  1215.     }

  1216. 

  1217.     if (chromaGBlur!=0.0) {

  1218.         filter->chrH= sws_getGaussianVec(chromaGBlur, 3.0);

  1219.         filter->chrV= sws_getGaussianVec(chromaGBlur, 3.0);

  1220.     } else {

  1221.         filter->chrH= sws_getIdentityVec();

  1222.         filter->chrV= sws_getIdentityVec();

  1223.     }

  1224. 

  1225.     if (chromaSharpen!=0.0) {

  1226.         SwsVector *id= sws_getIdentityVec();

  1227.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1228.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1229.         sws_addVec(filter->chrH, id);

  1230.         sws_addVec(filter->chrV, id);

  1231.         sws_freeVec(id);

  1232.     }

  1233. 

  1234.     if (lumaSharpen!=0.0) {

  1235.         SwsVector *id= sws_getIdentityVec();

  1236.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1237.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1238.         sws_addVec(filter->lumH, id);

  1239.         sws_addVec(filter->lumV, id);

  1240.         sws_freeVec(id);

  1241.     }

  1242. 

  1243.     if (chromaHShift != 0.0)

  1244.         sws_shiftVec(filter->chrH, (int)(chromaHShift+0.5));

  1245. 

  1246.     if (chromaVShift != 0.0)

  1247.         sws_shiftVec(filter->chrV, (int)(chromaVShift+0.5));

  1248. 

  1249.     sws_normalizeVec(filter->chrH, 1.0);

  1250.     sws_normalizeVec(filter->chrV, 1.0);

  1251.     sws_normalizeVec(filter->lumH, 1.0);

  1252.     sws_normalizeVec(filter->lumV, 1.0);

  1253. 

  1254.     if (verbose) sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1255.     if (verbose) sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1256. 

  1257.     return filter;

  1258. }

  1259. 

  1260. SwsVector *sws_allocVec(int length)

  1261. {

  1262.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1263.     if (!vec)

  1264.         return NULL;

  1265.     vec->length = length;

  1266.     vec->coeff  = av_malloc(sizeof(double) * length);

  1267.     if (!vec->coeff)

  1268.         av_freep(&vec);

  1269.     return vec;

  1270. }

  1271. 

  1272. SwsVector *sws_getGaussianVec(double variance, double quality)

  1273. {

  1274.     const int length= (int)(variance*quality + 0.5) | 1;

  1275.     int i;

  1276.     double middle= (length-1)*0.5;

  1277.     SwsVector *vec= sws_allocVec(length);

  1278. 

  1279.     if (!vec)

  1280.         return NULL;

  1281. 

  1282.     for (i=0; i<length; i++) {

  1283.         double dist= i-middle;

  1284.         vec->coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*M_PI);

  1285.     }

  1286. 

  1287.     sws_normalizeVec(vec, 1.0);

  1288. 

  1289.     return vec;

  1290. }

  1291. 

  1292. SwsVector *sws_getConstVec(double c, int length)

  1293. {

  1294.     int i;

  1295.     SwsVector *vec= sws_allocVec(length);

  1296. 

  1297.     if (!vec)

  1298.         return NULL;

  1299. 

  1300.     for (i=0; i<length; i++)

  1301.         vec->coeff[i]= c;

  1302. 

  1303.     return vec;

  1304. }

  1305. 

  1306. SwsVector *sws_getIdentityVec(void)

  1307. {

  1308.     return sws_getConstVec(1.0, 1);

  1309. }

  1310. 

  1311. double sws_dcVec(SwsVector *a)

  1312. {

  1313.     int i;

  1314.     double sum=0;

  1315. 

  1316.     for (i=0; i<a->length; i++)

  1317.         sum+= a->coeff[i];

  1318. 

  1319.     return sum;

  1320. }

  1321. 

  1322. void sws_scaleVec(SwsVector *a, double scalar)

  1323. {

  1324.     int i;

  1325. 

  1326.     for (i=0; i<a->length; i++)

  1327.         a->coeff[i]*= scalar;

  1328. }

  1329. 

  1330. void sws_normalizeVec(SwsVector *a, double height)

  1331. {

  1332.     sws_scaleVec(a, height/sws_dcVec(a));

  1333. }

  1334. 

  1335. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1336. {

  1337.     int length= a->length + b->length - 1;

  1338.     int i, j;

  1339.     SwsVector *vec= sws_getConstVec(0.0, length);

  1340. 

  1341.     if (!vec)

  1342.         return NULL;

  1343. 

  1344.     for (i=0; i<a->length; i++) {

  1345.         for (j=0; j<b->length; j++) {

  1346.             vec->coeff[i+j]+= a->coeff[i]*b->coeff[j];

  1347.         }

  1348.     }

  1349. 

  1350.     return vec;

  1351. }

  1352. 

  1353. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1354. {

  1355.     int length= FFMAX(a->length, b->length);

  1356.     int i;

  1357.     SwsVector *vec= sws_getConstVec(0.0, length);

  1358. 

  1359.     if (!vec)

  1360.         return NULL;

  1361. 

  1362.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1363.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]+= b->coeff[i];

  1364. 

  1365.     return vec;

  1366. }

  1367. 

  1368. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1369. {

  1370.     int length= FFMAX(a->length, b->length);

  1371.     int i;

  1372.     SwsVector *vec= sws_getConstVec(0.0, length);

  1373. 

  1374.     if (!vec)

  1375.         return NULL;

  1376. 

  1377.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1378.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]-= b->coeff[i];

  1379. 

  1380.     return vec;

  1381. }

  1382. 

  1383. /* shift left / or right if "shift" is negative */

  1384. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1385. {

  1386.     int length= a->length + FFABS(shift)*2;

  1387.     int i;

  1388.     SwsVector *vec= sws_getConstVec(0.0, length);

  1389. 

  1390.     if (!vec)

  1391.         return NULL;

  1392. 

  1393.     for (i=0; i<a->length; i++) {

  1394.         vec->coeff[i + (length-1)/2 - (a->length-1)/2 - shift]= a->coeff[i];

  1395.     }

  1396. 

  1397.     return vec;

  1398. }

  1399. 

  1400. void sws_shiftVec(SwsVector *a, int shift)

  1401. {

  1402.     SwsVector *shifted= sws_getShiftedVec(a, shift);

  1403.     av_free(a->coeff);

  1404.     a->coeff= shifted->coeff;

  1405.     a->length= shifted->length;

  1406.     av_free(shifted);

  1407. }

  1408. 

  1409. void sws_addVec(SwsVector *a, SwsVector *b)

  1410. {

  1411.     SwsVector *sum= sws_sumVec(a, b);

  1412.     av_free(a->coeff);

  1413.     a->coeff= sum->coeff;

  1414.     a->length= sum->length;

  1415.     av_free(sum);

  1416. }

  1417. 

  1418. void sws_subVec(SwsVector *a, SwsVector *b)

  1419. {

  1420.     SwsVector *diff= sws_diffVec(a, b);

  1421.     av_free(a->coeff);

  1422.     a->coeff= diff->coeff;

  1423.     a->length= diff->length;

  1424.     av_free(diff);

  1425. }

  1426. 

  1427. void sws_convVec(SwsVector *a, SwsVector *b)

  1428. {

  1429.     SwsVector *conv= sws_getConvVec(a, b);

  1430.     av_free(a->coeff);

  1431.     a->coeff= conv->coeff;

  1432.     a->length= conv->length;

  1433.     av_free(conv);

  1434. }

  1435. 

  1436. SwsVector *sws_cloneVec(SwsVector *a)

  1437. {

  1438.     int i;

  1439.     SwsVector *vec= sws_allocVec(a->length);

  1440. 

  1441.     if (!vec)

  1442.         return NULL;

  1443. 

  1444.     for (i=0; i<a->length; i++) vec->coeff[i]= a->coeff[i];

  1445. 

  1446.     return vec;

  1447. }

  1448. 

  1449. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1450. {

  1451.     int i;

  1452.     double max=0;

  1453.     double min=0;

  1454.     double range;

  1455. 

  1456.     for (i=0; i<a->length; i++)

  1457.         if (a->coeff[i]>max) max= a->coeff[i];

  1458. 

  1459.     for (i=0; i<a->length; i++)

  1460.         if (a->coeff[i]<min) min= a->coeff[i];

  1461. 

  1462.     range= max - min;

  1463. 

  1464.     for (i=0; i<a->length; i++) {

  1465.         int x= (int)((a->coeff[i]-min)*60.0/range +0.5);

  1466.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1467.         for (;x>0; x--) av_log(log_ctx, log_level, " ");

  1468.         av_log(log_ctx, log_level, "|\n");

  1469.     }

  1470. }

  1471. 

  1472. #if LIBSWSCALE_VERSION_MAJOR < 1

  1473. void sws_printVec(SwsVector *a)

  1474. {

  1475.     sws_printVec2(a, NULL, AV_LOG_DEBUG);

  1476. }

  1477. #endif

  1478. 

  1479. void sws_freeVec(SwsVector *a)

  1480. {

  1481.     if (!a) return;

  1482.     av_freep(&a->coeff);

  1483.     a->length=0;

  1484.     av_free(a);

  1485. }

  1486. 

  1487. void sws_freeFilter(SwsFilter *filter)

  1488. {

  1489.     if (!filter) return;

  1490. 

  1491.     if (filter->lumH) sws_freeVec(filter->lumH);

  1492.     if (filter->lumV) sws_freeVec(filter->lumV);

  1493.     if (filter->chrH) sws_freeVec(filter->chrH);

  1494.     if (filter->chrV) sws_freeVec(filter->chrV);

  1495.     av_free(filter);

  1496. }

  1497. 

  1498. void sws_freeContext(SwsContext *c)

  1499. {

  1500.     int i;

  1501.     if (!c) return;

  1502. 

  1503.     if (c->lumPixBuf) {

  1504.         for (i=0; i<c->vLumBufSize; i++)

  1505.             av_freep(&c->lumPixBuf[i]);

  1506.         av_freep(&c->lumPixBuf);

  1507.     }

  1508. 

  1509.     if (c->chrPixBuf) {

  1510.         for (i=0; i<c->vChrBufSize; i++)

  1511.             av_freep(&c->chrPixBuf[i]);

  1512.         av_freep(&c->chrPixBuf);

  1513.     }

  1514. 

  1515.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1516.         for (i=0; i<c->vLumBufSize; i++)

  1517.             av_freep(&c->alpPixBuf[i]);

  1518.         av_freep(&c->alpPixBuf);

  1519.     }

  1520. 

  1521.     av_freep(&c->vLumFilter);

  1522.     av_freep(&c->vChrFilter);

  1523.     av_freep(&c->hLumFilter);

  1524.     av_freep(&c->hChrFilter);

  1525. #if ARCH_PPC && (HAVE_ALTIVEC || CONFIG_RUNTIME_CPUDETECT)

  1526.     av_freep(&c->vYCoeffsBank);

  1527.     av_freep(&c->vCCoeffsBank);

  1528. #endif

  1529. 

  1530.     av_freep(&c->vLumFilterPos);

  1531.     av_freep(&c->vChrFilterPos);

  1532.     av_freep(&c->hLumFilterPos);

  1533.     av_freep(&c->hChrFilterPos);

  1534. 

  1535. #if ARCH_X86 && CONFIG_GPL

  1536. #ifdef MAP_ANONYMOUS

  1537.     if (c->lumMmx2FilterCode) munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1538.     if (c->chrMmx2FilterCode) munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1539. #elif HAVE_VIRTUALALLOC

  1540.     if (c->lumMmx2FilterCode) VirtualFree(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, MEM_RELEASE);

  1541.     if (c->chrMmx2FilterCode) VirtualFree(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, MEM_RELEASE);

  1542. #else

  1543.     av_free(c->lumMmx2FilterCode);

  1544.     av_free(c->chrMmx2FilterCode);

  1545. #endif

  1546.     c->lumMmx2FilterCode=NULL;

  1547.     c->chrMmx2FilterCode=NULL;

  1548. #endif /* ARCH_X86 && CONFIG_GPL */

  1549. 

  1550.     av_freep(&c->yuvTable);

  1551. 

  1552.     av_free(c);

  1553. }

  1554. 

  1555. struct SwsContext *sws_getCachedContext(struct SwsContext *context,

  1556.                                         int srcW, int srcH, enum PixelFormat srcFormat,

  1557.                                         int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1558.                                         SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1559. {

  1560.     static const double default_param[2] = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT};

  1561. 

  1562.     if (!param)

  1563.         param = default_param;

  1564. 

  1565.     if (context) {

  1566.         if (context->srcW != srcW || context->srcH != srcH ||

  1567.             context->srcFormat != srcFormat ||

  1568.             context->dstW != dstW || context->dstH != dstH ||

  1569.             context->dstFormat != dstFormat || context->flags != flags ||

  1570.             context->param[0] != param[0] || context->param[1] != param[1])

  1571.         {

  1572.             sws_freeContext(context);

  1573.             context = NULL;

  1574.         }

  1575.     }

  1576.     if (!context) {

  1577.         return sws_getContext(srcW, srcH, srcFormat,

  1578.                               dstW, dstH, dstFormat, flags,

  1579.                               srcFilter, dstFilter, param);

  1580.     }

  1581.     return context;

  1582. }